Question

In the following atoms and moleculates for the transition from n= 2 to n = 1, the spectral line of minimum wavelength will be produced by.

• A. Hydrogen atom
• B. Deuterium atom
• C. Uni-ionized helium
• D. di-ionized lithium

Answer 1

Answer: (D)

di-ionized lithium

Answer 2

$\frac{1}{\lambda} = RZ^{2}\left( \frac{1}{1^{2}} - \frac{1}{2^{2}} \right)$

For di-ionised lithium the value of Z is maximum.